SSRN Electronic Journal,
Год журнала:
2022,
Номер
unknown
Опубликована: Янв. 1, 2022
The
accumulation
of
poly
aluminum
chloride
(PAC)
in
dewatered
waste
activated
sludge
(WAS)
can
significantly
reduce
the
production
volatile
fatty
acids
(VFAs)
from
anaerobic
fermentation.
This
study
aims
to
explore
a
new
method
promote
VFA
by
relieving
inhibitory
effect
on
fermentation
WAS.
Herein,
combination
lysozyme
and
sodium
citrate
pretreatment
was
applied
stabilize
accelerate
solubilization
hydrolysis
efficiently
complexed
citrate,
which
is
conducive
inhibition
lysozymes
other
extracellular
hydrolases.
1.86,
1.72,
1.15
times
lysozyme,
protease,
α-glucosidase
activities,
respectively,
were
obtained
after
compared
control
group.
Moreover,
treatment
caused
greater
cell
lysis
attributed
dissolution
EPS
induced
as
surfactant.
As
result,
WAS
enhanced.
129.71
mg/g
VSS
soluble
proteins
26.3
polysaccharides
within
4
hours,
together
with
degradation
124%
more
75%
3
days,
providing
adequate
substrates
for
production.
4884
mg
COD/L
total
VFAs
6-day
following
pretreatment,
7.3
higher
than
that
provides
novel
approach
enhancing
containing
PAC,
contributes
promoting
carbon
source
recovery
solid
wastes.
Candida
Tropicalis
was
used
to
improve
the
dewaterability
of
activated
sludge
(AS)
and
reduce
its
biomass
by
degrading
EPS
in
AS.
The
protein,
polysaccharide,
hydrophilic
amino
acids
decreased
54.50,
29.20,
61.01%,
respectively.
Meanwhile,
molecular
weight
distribution
indicated
that
yeast
degraded
macromolecular
organics
into
small
ones.
direct
addition
AS
more
conducive
degradation.
With
0.75
g/L
wet
cells
24
h
aeration
enhanced
CST
MLSS
24.44
10.51%,
After
30
days
operation
lab-scale
continuous
SBRs,
were
reduced
6.37
±
2.01
3.57
0.52%,
FTIR
spectroscopy
results
showed
some
functional
groups
reduced.
This
study
provides
a
new
approach
for
in-situ
reduction
wastewater
treatment
plant.
